Firefox very slow to start, won't show any websites

On 9/19, firefox version 32.02 automatically downloaded, now it is taking over 5 minutes for Firefox to open and when it does, it does not go to my default website (yahoo). I cannot get to any websites since this update. I have tried the restore option in troubleshooting, but that does not help at all. How do I go back to the previous version?

Some problems occurs when your Internet security program was set
to trust the previous version of Firefox, but no longer recognizes your
updated version as trusted. Now how to fix the problem: To allow
Firefox to connect to the Internet again;
* Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
* Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see
'''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.]''' {web link}

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